Secondly, the level of cosine transform coding some of the improvements.

其次是对层次余弦变换编码部分的改进.

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D wavelet transform coding, SPIHT method is used.

3D的小波变换编码, 用的是SPIHT方法.

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The DCT was used as the main method of image transform coding for a long time.

图像压缩编码长期以来利用离散余弦变换(DCT)作为变换编码的主要技术.

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